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Ethernet disabled?

A few days ago my ethernet connection stopped working. I checked the router and cable with my laptop and the are fine. I looked at networking and it says ethernet is unplugged, and yes it is plugged in. I ran hardware information and it says the adapter is disabled. I looked at my bios and the adapter is enabled. I tried using a live CD of Fedora 27 and still no internet. I got a new network card as I thought it was the internet ethernet, but that connection has the same problem.

Anyone know of a way to test for whatever the heck is going on? All I can think of is either a hardware problem or firmware issue. I will try another distribution tomorrow to, but I'm not holding out hope. I would like to know what broke so it can be fixed... if at all

Re: Ethernet disabled?

What machine is this, desktop PC? If I got that right, you tried another PCI ethernet card and that one doesn't work as well?

First of all see if the card is recognized at. Use `lspci`. If you see the adapter in NetworkManager, then it should be. If you have an integrated ethernet adapter in the motherboard, make sure you are probing the right one. E.g. integrated vs. a separate card. The next step would be to see the status of a network device in nmcli as mentioned by tempest766. You can also search dmesg for ethernet device name assignment. It should say something like:

Code:

[ 1.701716] r8169 0000:04:00.0 enp4s0: renamed from eth0

Also, it would definitely help if you could test the hardware from another Live distribution or Windows.

Re: Ethernet disabled?

Originally Posted by OpenJacob

I have tried Ubuntu, same problem. I'm guessing its a firmware issue, but I don't know how to identify the problem.

Have you tried a different LAN cable? If the connection is not detected because of a broken cable then power management may be suspending the LAN adaptor. What happens when you turn the PC on, are the activity lights lit to begin with?

The output of journalctl -b may turn something up related to the realtek adaptor any entry should be bold if it's a warning and coloured if an error and start with either r8168 or r8169.

Re: Ethernet disabled?

If ifconfig sees it then it's a valid device with an installed driver. So, you either have a cabling problem, or there really is something wrong with the hardware...Alternately NetworkManager is fudged up and not managing it properly. To test that look up "making an ethernet UNMANAGED by NetworkNanager" and manually configure the ehternet to see if it works.